Means for classifying materials in jet impact pulverizers



P. ANGER Aug130, 1932.

MEANS FOR CLASSIFYING MATERIALS IN JET IMPACT PULVERIZERS Filed Feb. 5, 1931 am; M1530, 1932 I PAUL ANGER, OI KIEL, G

MEANS FOR CLASSIFYING MATERIALS IN JET IMPACT PULVEBIZEBB a ucaaoa filed February 5. 1931, Serial No.

This invention relates to a jet impact pulverizer' of the kind wherein the materials are thrown by an air or steam jet against an impact member and then blown lplwards by 5 the air current through a surroun g casing,

and the invention consists essentially in imparting to the gaseous carrier and to the material suspended therein, as they rise through v the casing, a circular motion strong enough it to cause the coarser particles to be se arated ofi by centrifugal force and returne to the pulverizing jet while allowing the finer particles to be carried away with the discharge air. 7 is The device employed for imparting circular motion to. the materials may consist of tan ential deflecting vanes arran ed in the radial path of the materials imme 'ately beneath the impact member, and means may so be provided for regulating the angular positions according to the desired eflt'ect.

When additional air is introduced into the pulverizer, this air may also be utilized for maintaining the materials in circulation, the additional et or jets being for this purpose introduced in a tangential direction.

Fig. 1 of the accompanying drawing rep-,

resents a vertical section, on the hne I--I of Fig. 2, of a pulverizer according to the invention,

Fig. 2 is a cross section on the line 11-11 of Fig. 1,

Figs. 3 and 4 are vertical sections of different modifications of the apparatus,

Fig. 5 is an enlarged portion of Fig. 4,

Fig. 6 is an inverted plan of Fig. 4,

Fig. 7 is a vertical section-of a further modification of the apparatus, and

Figs. 8 and 9 are sectional part views of modifications of the apparatus shown in Fig 7 I he apparatus comprises acasing into which the materials, such as coal orthe like, are fed from a chute 4 while a strong jet of air. or steam enters throu h a nozzle 3 at the funnel shape bottom 0 materials are caught by the jet and driven by the latter through a mixing tube 5 which directs them against an impact member 6 whereby they are disintegrated and then the casing. The

513,568, and in Germany November 27, 1928.

"flung outwards in a radial direction. In this radial path of the materials tangential deflecting vanes 7 are arranged, according to the invention, so as to impart to the materials and to the gaseous carrier a circular motion which is continued while the materials are carried upwards through the casing. The circular motion is strong enough to cause the coarser particles to be thrown b the centrifugal force against the casing wa' l and to be returned along the latter together with the fresh materials to be pulverizing jet for renewed treatment, while the finer and therefore lighter particles are carried. away by the air through a discharge pipe 8 at the top of the casing.

In the construction according to Figs. 1 and 2, the casing comprises two conical portions 1 and 2 which are interconnected at their wide ends so that the casing tapers upwards as well as downwards. The upper portion of the casing is double-walled, and the impact member 6 and the deflecting vanes 7 are arranged so that thefdisintegrated materials are circulated within the inner cone 9 while the fresh materials are fed downwards through the space between the walls. The inner casing 9 is provided with perforations 10 through which the course, centrifugally separated particles pass into the space between the walls where they descend together with the fresh materials to the bottom of the casing for renewed treatment.

The shape of the casing may be varied. In the devlce shown in Fi 3, the upper portion 2a of the casing'is cy indrical and, since there is therefore a greater distance between. the walls and the discharge pipe 8, the-casing can be made shorter without detriment to the separating action. The inner cylinder 90 may be provided with longitudinal slits 10 instead of round apertures. With this construction of the casing it is also possible to do without the inner wall, as shownin Fig. 7. As even better action is obtained with the casing 1a shown in Fi 4, which is constructed as an inverte cone and leaves, around the discharge pipe 8, a wide space wherein the movement of the materials is' decelerated and the coarser particles enabled to descend along the inclined casing walls.

Means may be provided for varying the an at positions of the deflecting vanes 7 an thereby regulating the sifting action according to requirements. For this purpose the vanes may, as shown in Figs. 1,2, 3 and 7,

be connected to vertical shafts 11 which can be turned from the outside by means of crank handles 12.

An alternative arrangement is shown. in Figs. 4 to 6 wherein the vanes are mounted on pivots 18 connected to a conical guide ring 4 which surrounds the impact member 6. The ring is rotatable to a limited extent and can beadjusted from the outside by means of a hand wheel 15 connected to a shaft carrying a forked arm 16,the latter engaging a pin 17 on the ring. The inner ends of the vanes 7 are fitted with pivot pins 21 which engage in radial guideways made at the underside of a stationary ring 13 situated between the ring 14 and the impact member 6, the latter being supported on the ring 13. The displacement of the pivots 18 by means of the hand wheel 15 brings about the required adjustment of the vanes. The pivots 18 are connected to lugs between which, as shown in Fig. 6, spaces 19 are left for the discharge of materials settling within the ring 14.

Additional air, when such is introduced into the pulverizer, may also be utilized, as shown in Fig. 7, for maintaining the materials in circulation, the air being for this purpose introduced in a tangential direction. The additional air'may be introduced through radial nozzles 22 behind which adjustable vanes 23 are arranged for deflecting the jets in the desired tangential direction. The vanes 23 may be omitted, and the casing may be fitted with adjustable nozzles 24 as shown in Fig. 8. It is also possible to em loy fixed nozzles 25 arranged, as shown in ig. 9, so as to give the air jets originally a tangential direction, alterations in the direction being effected by means of adjustable vanes 26.

,A s ace 27 is preferably left between the vanes and the upper end of the mixing pipe 5, to enable coarse particles to be re elled and returned to the pulverizing jet without touching the vanes, the latter being thereby protected from excessive wear.

. The air or steam may either be sucked or forced through the casing. 55 Iclaim: V

1. A jet impact pulverizer of the character described, comprising a casing, means for feeding materials into said casing, means for forcinga vertical stream of fluid into said casing and through said materials so ing means-in said casing adapted to impart a whirling motion to the stream of fluid and reduced particles coming from said impact member, and means in said casing for guiding the centrifugally separated coarser par ticles back into the entering stream of fluid.

2. A structure as claimed in claim 1 wherein the casing has a double wall within its upper portion and wherein the materials are fed into the casing through the space between the walls.

3. A structure as claimed in claim 1 wherein the casing has a double Wall Within its upper portion and wherein the materials are fed into the casing through the space between the walls, the inner wall being perforated to admit the centrifugally separated trained particles and direct them towards the v impact member, the deflecting means being spaced from the tube to enable coarser particles tovbe returned to the stream of fluid before its entrance into the tube without touching the deflecting means.

7. The structure claimed in claim 1 in combination with means for introducing additional fluid in a tangential direction into said casing.

8. The structure claimed in claim 1 in combination with adjustable means for introducing additional fluid in a tangential direction into said casing.

9.,The structure claimed in claim 1 in combination with means for introducing additional fluid into said casing, and means for tangentially deflecting said additional fluid within said casing.

10. The structure claimed in claim 1 in combination with means for introducing ad ditional fluid into said casing, and means for tangentially deflecting said additional fluid wit adjustable for varying the tangential direction of said additional fluid.

PAUL ANGER.

as to entrain particles of said materials, an Y impact member in said casing arranged in the path of said stream of fluid and entrained particles so as to cause the latter to be re- 66 duced by impact with said member, deflectin said casing said latter means being 

